No electric shock, no liquid propellant is used. It is the safest, most humane and used widely way to keep your own dog or your neighbors dog from barking. Your spirit will be getting better and better, your work will be more and more efficient, your sleep will be guaranteed. Power: 9V Battery(battery not included) How it works: When the outdoor bark control is within range of a barking dog,an internal microphone pick up the sound and the unit is automatically activated. The outdoor bark control emits an ultrasonic sound.the ultrasonic sound can be heard by dogs but is silent to humans. Startled by the high-pitched sound that is safe and effective, the dog should stop barking,it will associate its bark with this unpleasant noise. When the dog stops barking the ultrasonic sound also stops. The outdoor bark control has 3 range levels and a test mode. It is effective up to 50 feet. Possible Uses Only for dogs. It is normal that the Dog Bark Controller may have a reaction when human voice reaches a certain decibel. Just avoid standing very close to it when it is on. It should be placed facing the dog and within range of the dog. The unit is designed with provisions for hanging and should be positioned at a height of no more than 5 feet. It can be placed in a tree, hanging from a pole, on a fence post, etc. Modes of Operation Turn on the Low Range setting begin use it and only increase to the Medium Range setting if the dog does not respond. If the dog does not respond to the Medium Range, increase to High Range Turn to the TEST Mode to verify that your item is working properly. Do not use this Mode for normal operation. Please see the instruction to know how to test.
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